A rail-movable small gantry crane

Abstract

The present invention relates to the technical field of gantry cranes, specifically to a track-movable small gantry crane, the traveling base comprising a base whose top surface is fixedly connected to the bottom end of a gantry frame and whose bottom is supported on the top surface of the track, a driving device fixed to the front end of the top surface of the base, and traveling wheels driven by the driving device and rolling along the side walls of the track, the two side walls of the base are respectively fixed with a lifting and telescopic cylinder extending vertically, the bottom end of the lifting and telescopic cylinder piston rod is connected to a support plate, the track comprises at least two linear rails and a plurality of swing rails arranged between the linear rails, the two ends of the swing rails are provided with tips, the ends of the swing rails are respectively provided with a transmission mechanism for driving them to swing horizontally relative to the adjacent track part, and the swing rails are suspended from the ground; the track lifting and traveling assembly is also included, the track lifting and traveling assembly is used to lift the linear rail off the ground, and the bottom surface of the track lifting and traveling assembly is provided with a universal wheel structure; the problem that small gantry cranes cannot flexibly transfer the lifting operation range is well solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gantry cranes, in particular to a track-movable small gantry crane. Background Art

[0002] A gantry crane, also known as a gantry crane, is a variation of the bridge crane. Its metal structure resembles a gate-shaped frame, with two legs mounted beneath the main beam, allowing it to travel directly on ground tracks. The main beam can have cantilever beams extending outwards at either end. It is primarily used for loading and unloading outdoor cargo yards, material yards, and bulk cargo. Gantry cranes offer high site utilization, a wide operating range, wide adaptability, and strong versatility, making them widely used in port cargo yards.

[0003] Currently, a type of small gantry crane is widely used within factories. Its structure is similar to that of a general-purpose gantry crane, but it is smaller in size. However, due to factory space constraints, small gantry cranes are typically small in width and height. Furthermore, their tracks are fixed to the factory floor, which directly restricts their operating range. However, within factories, there is often a challenge with shifting the lifting range, a requirement that existing small gantry cranes struggle to meet. Summary of the Invention

[0004] The purpose of the present invention is to provide a track-movable small gantry crane to solve the problem that small and medium-sized gantry cranes in the prior art cannot flexibly transfer the lifting operation range.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a rail-movable small gantry crane, comprising a rail, a gantry, and a traveling base fixed to the bottom ends of both sides of the gantry and moving along the rail, the traveling base comprising a top surface fixedly connected to the bottom end of the gantry and supported by the bottom on the top surface of the rail, a driving device fixed to the front end of the top of the base, and traveling wheels driven by the driving device and rolling along the side walls of the rail, the two side walls of the base are respectively fixed with a lifting and telescopic cylinder extending vertically, the bottom end of the lifting and telescopic cylinder piston rod is connected to a support plate, the rail comprises at least two linear rails and a plurality of swing rails arranged between the linear rails, the two ends of the swing rails are provided with tips, the ends of the swing rails are respectively provided with a transmission mechanism for driving them to swing horizontally relative to the adjacent rail part, and the swing rails are suspended above the ground; the rail-lifting traveling assembly is also included, the rail-lifting traveling assembly is used to lift the linear rail off the ground, and the bottom surface of the rail-lifting traveling assembly is provided with a universal wheel structure.

[0006] Preferably, the bottom surface of the linear rail is fixedly connected to a bottom beam, and a plurality of column cavities are axially provided in the linear rail, an axial hole is provided at the center of the bottom surface of the column cavity, a through-hole is provided on the top surface of the bottom beam corresponding to the position of the through-hole, and a circular groove is provided on the bottom surface of the bottom beam corresponding to the position of the through-hole. The track lifting and walking assembly includes a lifting and telescopic cylinder fixed in the column cavity and the piston rod passes through the axial hole and the through-hole in turn, and a disc rotatably fitted on the bottom end of the piston rod of the lifting and telescopic cylinder and movably fitted on the top of the inner cavity of the circular groove. A plurality of square grooves are provided on the bottom surface of the disc, and a roller is rotatably installed in the square groove, and the bottom end of the roller protrudes from the bottom surface of the disc.

[0007] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket. The tooth on the attachment piece is meshed with tooth on upper sprocket.

[0008] Preferably, a slot is provided in the center of the bottom surface of the base to be clamped in the top of the track, and the central axis of the walking wheel is rotatably mounted on both sides of the front end of the top surface of the inner cavity of the slot. A gear cavity is provided in the front portion of the base, and the central axis of the walking wheel extends to the top of the gear cavity and is fixedly mounted with a driven gear, and the power output shaft of the driving device extends to the bottom end of the gear cavity and is fixedly mounted with a driving gear, the driving gear is meshed with one of the driven gears, and a transition gear is rotatably mounted in the inner cavity of the gear cavity between the other driven gear and the driving gear, and the two sides of the transition gear are respectively meshed with the corresponding driven gear and the driving gear.

[0009] Preferably, the bottom ends of the two side walls of the base are respectively provided with fixed plates extending in the horizontal direction, the bottom end of the piston cylinder of the lifting and telescopic cylinder is fixed to the top surface of the fixed plate, and the piston rod passes through the fixed plate and is connected to the support plate.

[0010] Preferably, a middle groove is provided in the middle of the top surface of the inner cavity of the card slot, and a support roller is rotatably installed between the two side walls of the middle groove, and the support roller is supported on the top surface of the track.

[0011] Preferably, side grooves are respectively provided on both sides of the rear part of the top surface of the inner cavity of the card slot, and a swing guide rail assembly is provided in the side groove. The swing guide rail assembly includes a short beam extending in the longitudinal direction, a bottom end rotatably mounted on the center position of the top surface of the short beam and a top end connected to the central axis of the top surface of the inner cavity of the side groove, and guide wheels rotatably installed on both ends of the bottom of the short beam, and at least one of the guide wheels is supported on the side of the track.

[0012] Preferably, the end face of the tip is processed into a curved surface structure.

[0013] Preferably, the gear cavity is filled with gear oil.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention relates to a track-movable small gantry crane which can not only realize the step-by-step linear motion of the entire track, but also adjust the track to turn, thereby realizing the flexible transfer of the lifting operation range of the small gantry crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic side view of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the main structure of the walking base of the present invention;

[0018] Figure 3 It is a rear structural schematic diagram of the walking base of the present invention;

[0019] Figure 4 Schematic diagram of the three-dimensional structure of the linear rail of the present invention;

[0020] Figure 5 Schematic diagram of the three-dimensional structure of the swing rail of the present invention;

[0021] Figure 6 Schematic diagram of the three-dimensional structure of the bottom beam of the present invention;

[0022] Figure 7 Schematic diagram of the three-dimensional structure of the swing guide wheel assembly of the present invention;

[0023] Figure 8 This is a schematic diagram of the three-dimensional structure of the track lifting and traveling assembly of the present invention;

[0024] Figure 9 For the present invention Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 10 For the present invention Figure 1 Schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 11 For the present invention Figure 1 Schematic diagram of the enlarged structure at point C in the middle.

[0027] In the figure: 1- portal frame;

[0028] 2-travel base; 21-base; 211-cage; 212-gear cavity; 213-transition gear; 214-middle slot; 215-side slot; 22-driving device; 221-driving gear; 23-travel wheel; 231-driven gear; 24-support roller; 25-fixed plate; 26-lifting and telescopic cylinder; 27-support plate;

[0029] 3- linear rail; 31- cylindrical cavity 1; 32- shaft hole 1; 33- socket 1;

[0030] 4-swing rail; 41-column cavity 2; 42-axis hole 2; 43-jack 2; 44-tip;

[0031] 5- bottom beam; 51- circular groove; 52- through hole; 53- extension plate; 54- axis hole three;

[0032] 6-angle motor; 61-angle gear;

[0033] 7-fixed gear; 71-connecting plate;

[0034] 8-swing guide wheel assembly; 81-short beam; 82-middle shaft; 83-guide wheel;

[0035] 9-track lifting and traveling assembly; 91-lifting and telescopic cylinder; 92-disc; 921-square groove; 93-roller. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] See also Figure 1-9 The present invention provides a technical solution, a rail-movable small gantry crane, comprising a rail, a gantry frame 1, and a walking base 2 fixed to the bottom ends of both sides of the gantry frame 1 and moving along the rail.

[0038] The walking base 2 includes a base 21 whose top surface is fixedly connected to the bottom end of the portal frame 1 and whose bottom is supported on the top surface of the track, a driving device 22 fixed to the front end of the top of the base 21, and a walking wheel 23 driven by the driving device 22 and rolling along the side wall of the track.

[0039] As for the walking drive structure of the walking base 2, a slot 211 is provided in the center of the bottom surface of the base 21, which is stuck in the top of the track. The central axis of the walking wheel 23 is rotatably mounted on both sides of the front end of the top of the inner cavity of the slot 211. A gear cavity 212 is provided in the front part of the base 21. The central axis of the walking wheel 23 extends to the top of the gear cavity 212 and is fixedly mounted with a driven gear 231. The power output shaft of the driving device 22 extends to the bottom end of the gear cavity 212 and is fixedly mounted with a driving gear 221. The driving gear 221 is meshed with one of the driven gears 231, and the inner cavity of the gear cavity 212 is located between the other driven gear 231 and the driving gear 221, and a transition gear 213 is rotatably installed. The two sides of the transition gear 213 are respectively meshed with the corresponding driven gear 231 and the driving gear 221. The driving device 22 is composed of a motor and a reducer, which directly drives the driving gear 221 to rotate. The rotating driving gear 221 directly drives one of the driven gears 231 to rotate through a meshing relationship, and at the same time drives the other driven gear 231 to rotate through the transition gear 213; in this way, the two driven gears 231 rotate synchronously in opposite directions, thereby causing the two walking wheels 23 to rotate synchronously along both sides of the track, so as to realize the forward and backward movement of the walking base 2 as a whole relative to the track.

[0040] To ensure smooth meshing and transmission between the gears and extend their service life, the gear cavity 212 is filled with gear oil. A central groove 214 is provided in the middle of the top surface of the inner cavity of the slot 211. Support rollers 24 are rotatably mounted between the two side walls of the central groove 214 and supported on the top surface of the track. When the walking base 2 is moving, the support rollers 24 rest on the top surface of the track, not only supporting the walking base 2 as a whole but also significantly reducing the frictional resistance between the walking base 2 and the track. In actual use, multiple sets of support rollers 24 can be installed on the bottom of each walking base 2, depending on the situation.

[0041] Horizontally extending fixed plates 25 are provided at the bottom ends of the two side walls of the base 21. The bottom ends of the piston cylinders of the lifting and telescopic cylinders 26 are fixed to the top surfaces of the fixed plates 25, and the piston rods pass through the fixed plates 25 and connect to the support plates 27. When the lifting and telescopic cylinders 26 are extended, the support plates 27 are supported on the ground, thereby lifting the walking base 2 and the portal frame 1 as a whole, so that the slots 211 at the bottom of the base 21 are separated from the top surface of the track.

[0042] The track includes at least two linear rails 3 and a plurality of swing rails 4 arranged between the linear rails 3. The two ends of the swing rail 4 are provided with a tip 44, and the end face of the tip 44 is processed into an arc structure. The ends of the swing rail 4 are respectively provided with a transmission mechanism for driving it to swing horizontally relative to the adjacent track part, and the swing rail 4 is suspended from the ground. The specific structure is: a column cavity 2 41 is provided inside one end of the swing rail 4, and an axis hole 2 42 is provided at the center of the bottom surface of the column cavity 2 41. An angle motor 6 is fixed vertically in the column cavity 2 41. The power output shaft of the angle motor 6 passes through the axis hole 2 42 and is fixedly sleeved with an angle gear 61. A socket 2 43 is provided on the bottom surface of the other end of the swing rail 4, and a fixed gear 7 is fixedly sleeved in the socket 2 43. A socket 1 33 is provided at both ends of the bottom surface of the linear rail 3, and a fixed gear 7 is also fixedly sleeved in the socket 1 33. Both ends of the bottom beam 5 An extension plate 53 is fixed to the bottom, and a third socket 54 is provided at the end of the extension plate 53. The fixed gear 7 is engaged with the adjacent angle gear 61 and the fixed gear 7. The bottom end of the central axis of the angle gear 61 and the fixed gear 7 adjacent to the end of the linear rail 3 is rotatably sleeved in the third socket 54. The bottom end of the central axis of the fixed gear 7 at the end of the swing rail 4 is sleeved with a connecting plate 71, and the other end of the connecting plate 71 is rotatably sleeved with the bottom end of the central axis of the corresponding angle gear 61, and the bottom surface of the connecting plate 71 is higher than the ground.

[0043] The angle motor 6 drives the angle gear 61 to rotate. Since the fixed gear 7 meshing with the angle gear 61 is fixed, the angle motor 6 provides a force for the swing rail 4 to swing relative to the adjacent linear rail 3 and the swing rail 4 .

[0044] The track lift assembly 9 is used to lift the linear track 3 off the ground. A universal wheel structure is provided on the bottom surface of the track lift assembly 9. When the linear track 3 is lifted off the ground, the universal wheel structure supports the track. The rolling friction of the running wheels 23 enables the track to move linearly, ultimately achieving step-by-step linear movement of the entire track. Among them, the specific structure of the track lifting and walking component 9 is as follows: the bottom surface of the linear rail 3 is fixedly connected to the bottom beam 5, and a plurality of column cavities 31 are axially provided in the linear rail 3, and an axial hole 32 is provided at the center of the bottom surface of the column cavity 31. A through-hole 52 is provided on the top surface of the bottom beam 5 corresponding to the axial hole 32, and a circular groove 51 is provided on the bottom surface of the bottom beam 5 corresponding to the through-hole 52. The track lifting and walking component 9 includes a lifting and telescopic cylinder 91 fixed in the column cavity 31 and a piston rod passing through the axial hole 32 and the through-hole 52 in sequence, and a disc 92 rotatably fitted on the bottom end of the piston rod of the lifting and telescopic cylinder 91 and movably fitted on the top of the inner cavity of the circular groove 51. The bottom surface of the disc 92 is provided with a plurality of square grooves 921, and a roller 93 is rotatably installed in the square groove 921, and the bottom end of the roller 93 protrudes from the bottom surface of the disc 92. That is, when the piston rod of the telescopic cylinder 91 is extended, the disc 92 will move downward along the circular groove 51 until the roller 93 is supported on the ground. Since the disc 92 can rotate relative to the piston rod of the telescopic cylinder 91 and the roller 93 can roll on the horizontal plane, the whole constitutes a universal wheel structure.

[0045] Side grooves 215 are provided on either side of the rear portion of the top surface of the inner cavity of the slot 211. A swing rail assembly 8 is provided within the side grooves 215. The swing rail assembly 8 comprises a short beam 81 extending longitudinally, a central shaft 82 whose bottom end is rotatably mounted on the center of the top surface of the short beam 81 and whose top end is connected to the top surface of the inner cavity of the side groove 215, and guide wheels 83 rotatably mounted on both ends of the bottom of the short beam 81. At least one guide wheel 83 is supported on the side of the track. This ensures that the guide wheels 83 provide good guiding support when the walking base 2 is moving in a straight line or turning.

[0046] To adjust the lifting range of the small gantry crane in a straight line, the lifting and telescopic cylinder 26 first pushes the support plate 27 downward to the ground. The piston rod of the lifting and telescopic cylinder 26 continues to extend, lifting the traveling base 2 and the portal frame 1 as a whole. This allows the support rollers 24 to separate from the top surface of the track, creating space for the entire track to be lifted. The lifting and telescopic cylinder 91 then pushes the disc 92 downward from the circular groove 51, lifting the bottom surface of the bottom beam 5 off the ground and supporting the rollers 93 on the ground. The drive device 22 is activated, and the running wheels 23 rotate, causing the entire track to move in a straight line.

[0047] When the track needs to be adjusted in angle, it is necessary to ensure that the walking base 2 is located above the linear rail 3, and the angle motor 6 near the rear end linear rail 3 drives the angle gear 61 to rotate, and the angle gear 61 rotates relative to its meshing fixed gear 7, so that the front part of the track swings as a whole, and then the front angle motors 6 are turned on in turn to make the multiple swing rails 4 slowly bend, so that the curvature radius of the track is suitable for the movement of the walking base 2. At the same time, it is necessary to ensure that the turning radius of the two parallel tracks is consistent to ensure the smooth movement of the entire portal frame 1 structure.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rail-movable small gantry crane, comprising a rail, a gantry frame (1), and a walking base (2) fixed to the bottom ends of both sides of the gantry frame (1) and moving along the rail, characterized in that: The walking base (2) comprises a base (21) whose top surface is fixedly connected to the bottom end of the portal frame (1) and whose bottom is supported on the top surface of the track, a driving device (22) fixed to the front end of the top of the base (21), and a walking wheel (23) driven by the driving device (22) and rolling along the side wall of the track, and a lifting and telescopic cylinder (26) extending vertically is fixed to both side walls of the base (21), and the bottom end of the piston rod of the lifting and telescopic cylinder (26) is connected to a support plate (27); The track comprises at least two linear rails (3) and a plurality of swing rails (4) arranged between the linear rails (3), with tips (44) provided at both ends of the swing rails (4), and transmission mechanisms for driving the swing rails (4) to swing horizontally relative to adjacent track portions at the ends thereof, and the swing rails (4) are suspended above the ground; It also includes a track lifting and traveling assembly (9), the track lifting and traveling assembly (9) is used to lift the linear rail (3) off the ground, and the bottom surface of the track lifting and traveling assembly (9) is provided with a universal wheel structure; The bottom surface of the linear rail (3) is fixedly connected to a bottom beam (5), a plurality of column cavities (31) are provided in the axial direction of the linear rail (3), an axis hole (32) is provided at the center of the bottom surface of the column cavity (31), a through hole (52) is provided on the top surface of the bottom beam (5) at a position corresponding to the axis hole (32), a circular groove (51) is provided on the bottom surface of the bottom beam (5) at a position corresponding to the through hole (52), and the track lifting and walking assembly (9) includes a plurality of column cavities (31) provided in the axial direction of the linear rail (3), a plurality of column cavities (31) are provided in the center of the bottom surface of the column cavity (31), a through hole (52) is provided on the top surface of the bottom beam (5) at a position corresponding to the axis hole (32), and a circular groove (51) is provided on the bottom surface of the bottom beam (5) at a position corresponding to the through hole (52). A lifting and telescopic cylinder (91) is provided in the column cavity (31) and its piston rod passes through the shaft hole (32) and the through hole (52) in sequence, and a disc (92) is rotatably mounted on the bottom end of the piston rod of the lifting and telescopic cylinder (91) and movably mounted on the top of the inner cavity of the circular groove (51). The bottom surface of the disc (92) is provided with a plurality of square grooves (921). A roller (93) is rotatably mounted in the square groove (921), and the bottom end of the roller (93) protrudes from the bottom surface of the disc (92).

2. A rail-movable small gantry crane according to claim 1, characterized in that: A second column cavity (41) is provided inside one end of the swing rail (4), and a second shaft hole (42) is provided at the center of the bottom surface of the second column cavity (41). A rotation angle motor (6) is fixed vertically in the second column cavity (41), and a power output shaft of the rotation angle motor (6) passes through the second shaft hole (42) and is fixedly sleeved with a rotation angle gear (61). A second plug hole (43) is provided on the bottom surface of the other end of the swing rail (4), and a fixed gear (7) is fixedly sleeved in the second plug hole (43). Plug holes (33) are provided at both ends of the bottom surface of the linear rail (3), and a fixed gear (7) is also fixedly sleeved in the plug hole (33). The two ends of the bottom beam (5) are provided with a plurality of screw holes. An extension plate (53) is fixed to the bottom, and a socket three (54) is provided at the end of the extension plate (53). The fixed gear (7) is meshed with the adjacent corner gear (61) and the fixed gear (7). The bottom ends of the central shafts of the corner gear (61) and the fixed gear (7) adjacent to the end of the linear rail (3) are rotatably sleeved in the socket three (54). The bottom end of the central shaft of the fixed gear (7) at the end of the swing rail (4) is sleeved with a connecting plate (71), and the other end of the connecting plate (71) is rotatably sleeved with the bottom end of the central shaft of the corresponding corner gear (61). The bottom surface of the connecting plate (71) is higher than the ground.

3. The rail-movable small gantry crane according to claim 1, characterized in that: A slot (211) is provided in the center of the bottom surface of the base (21) for being clamped on the top of the track. The central axis of the running wheel (23) is rotatably mounted on both sides of the front end of the inner cavity top of the slot (211). A gear cavity (212) is provided in the front portion of the base (21). The central axis of the running wheel (23) extends to the top of the gear cavity (212) and is fixedly mounted with a driven gear (231). The power output shaft of the driving device (22) extends to the bottom of the gear cavity (212) and is fixedly mounted with a driving gear (221). The driving gear (221) is meshed with one of the driven gears (231). A transition gear (213) is rotatably mounted in the inner cavity of the gear cavity (212) between the other driven gear (231) and the driving gear (221). Both sides of the transition gear (213) are respectively meshed with the corresponding driven gear (231) and the driving gear (221).

4. The rail-movable small gantry crane according to claim 1, characterized in that: The bottom ends of the two side walls of the base (21) are respectively provided with fixed plates (25) extending in the horizontal direction, the bottom end of the piston cylinder of the lifting and telescopic cylinder (26) is fixed to the top surface of the fixed plate (25), and the piston rod passes through the fixed plate (25) and is connected to the support plate (27).

5. The rail-movable small gantry crane according to claim 3, characterized in that: A middle groove (214) is provided in the middle of the top surface of the inner cavity of the clamping groove (211), and a support roller (24) is rotatably installed between two side walls of the middle groove (214), and the support roller (24) is supported on the top surface of the track.

6. The rail-movable small gantry crane according to claim 5, characterized in that: Side grooves (215) are respectively provided on both sides of the rear portion of the top surface of the inner cavity of the card slot (211), and a swing guide rail assembly (8) is provided in the side groove (215). The swing guide rail assembly (8) includes a short beam (81) extending in the longitudinal direction, a central axis (82) with a bottom end rotatably mounted on the center position of the top surface of the short beam (81) and a top end connected to the top surface of the inner cavity of the side groove (215), and guide wheels (83) rotatably mounted on both ends of the bottom of the short beam (81), and at least one of the guide wheels (83) is supported on the side surface of the track.

7. The rail-movable small gantry crane according to claim 1, characterized in that: The end surface of the tip (44) is processed into a curved surface structure.

8. The rail-movable small gantry crane according to claim 3, characterized in that: The gear cavity (212) is filled with gear oil.

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